Rotary machine



Julyy 2, 1929. l. H, WlLsEy 1,719,639

ROTARY MACHINE Filed Sept. 3, 1925 Patented `July 2, 1929.

IUNITED STATES --1,719,639 PATENT oFFlcE.

IRVEN H. WILSEY, OF CHICAGO, ILLINOIS, ASSIGNOR '.lO JAMES IB. TUTHILL,OF i CHICAGO,

' ILLINOIS.

ROTARY MACHINE.

Application led September 3, 1926. Serial No. 133,349.

The present invention relates to improvements in rotary machines of thegear type.

The general object of the invention 1s to provide a rotary engine whichis simple and inexpensive in construction, which is subject to a minimumamount of wear in operation land is therefore durable, which has a highefliciency, and which will require a minimum power output for a givencapacity..

A further object resides in the provision of a rotary machine havingcut-off lands separate from the main casing so that the lands may becase-hardened or made of material having good wearing quallties. t Stillanother object resides in the provision of lands of thepabove characterwhich are pressed yieldingly into engagement with the peripheral surfaceof the rotor so that the lands will be self-seating, will follow thecontour of the rotor as wear occurs, will move to permit grit, chips,and small particles of any kind to pass through the machine withoutcausing excessive wear, will adjust themselvesfor different fluid filmthicknesses, and will relieve excessive pressures.

Further objects and advantages will become apparent as the descriptionproceeds. In the accompanying drawings,

Figure 1- is a side elevation of a gear pump embodying the features ofmy invention. y

Fig. 2 is a transverse section of the pump taken substantially alongline 2-2 of Fig. 1.

Fig. 3 is a section similar to Fig. 2, but showing a modified form of myinvention.

Fig. 4 is an endelevation of the pump.

Fig. 5 is a longitudinal section of the pump taken substantially alongline 5-5 of Fig. 2.

While the invention is susceptible of various modifications andalternative constructions, I have shown in the drawings and will hereindescribe in detail the preferred embodiment, but it is to be understoodthat I do not thereby intend to limit'the invention to the specific formdisclosed, but intend to cover all modifications and alternativeconstructions fallin within the spirit and scope of the invention asexpressed in the appended claims.

Referring more specifically to the drawings, the exemplary embodiment ofthe invention consists of a pump casing 10 which (not shown).

is supported by a suitable base 11 and which 55 preferably iscylindrical in shape. The interior of the casing is also cylindrical inshape and communicates at opposite sides with fluid admission anddischarge ports 12 and 13 which are adapted to be connected 60 .in anydesired fluid line (not shown). Diametrically opposed lands 14 and 15are mounted in the peripheral wall of the casing 10, and separate-theinterior of the casing into fluidadmission .and 'discharge 65 chambers16 and 17. The ends of the casing 10 are closed by`removable heads 18and 19 held in place by a plurality of screws 20.

A rotor is mounted centrally in the casing 10 and on a drive shaft 21adapted to 70 be connected to a suitable source of-power The shaft 21extends outwardly througha bearing hub 22 which in the present instanceis formed integral with the outer face of the head 181and with the 75base 11. The rotor is substantially smaller in diameter than theinterior of the casing 10, and therefore defines with the latter anannular space which is divided by the lan s i 14 and 15 to provide thechambers 16 and 80 17 referred to in the foregoing. The rotor comprisesa circular plate 23 formed on its inner face with laterally projecting'circumferentially spaced internal gear teeth 24 of any suitable form.The spaces 25 between 85 these teeth are adapted upon rotation of theshaft 21 to be moved successively across the lands 14 and 15 fromcommunication with one to the other of the chambers 16 and 17.

On its inner face, the removable head 19 90 has a pin 26 which extendsinwardly/into the circular space between the teeth 24, and eccentricallyof the shaft 21. An idler-pins f ion'27, having teeth 28 of any suitableforni` adapted to fit into the spaces 25 between the 95 teeth 24 isArotatably mounted' on a bushing 29 on the pin 26. The pinion 27 meshesat one side, in the present instance adjacent the land 14, with theteeth 24 of the rotor, and will'be rotated upon rotation of the latter.100 The other side of the pinion 27 is spaced from the teeth 25, and isseparated therefrom by a crescent-shaped projection or artition 30formed integral with and exten ing inwardly from the removable head 19and 105 bearing against the inner ends of the teeth 24 and the outerends of the teeth 28 through approximately The outer and inner formrespectively to the curvature of the internal gear and of the pinion 27By making the'lands 14 and 15 separate from the casing l0, said landscan be casehardened or made of material highly resistant to wear,thereby prolonging the life and efficiency of the pump. While the landsmay be mounted in the casing 10 in any suitable manner, I pre-fer tomount them for pivotal movement into and of engagement with the rotor.Referring to Figs. 2 and 3, each land is provided in the form of a platefitting between the heads 18 and 19, and

shaped to conform to the curvature of the v rotor. On one end, each landis formed with a ball 31 which fits into a socket 32 formed in the innerperipheral wall of the casing. Each land is yieldingly held inengagement with the periphery of the rotor by a spring 33 which is, intheupresent instance, mounted in a bore 34 opening radially through thecasing wall. The outerfend of each bore 34 is closed by an adjustablescrew-threaded plug 35 having a pin 36 'on its 4inner end which pinextends into the outer, end of the spring 33 and serves to hold thelatter in position. The inner end of the spring 33 seats on a projection37 on the outer face of the land. The ball'and socket joints for thelands 14 and 15 are preferably located in the same side of' the casing,and may be adjacent` the port 12, as shown in Fig. 2, or adjacent theport 13, as shown in 1 Fig. 3. One form may be quickly changed to theother form by merely reversing the casing lO'between the heads 18 and19.

By providing lands yieldingly engaging the rotor, it will be seen thatgrit, dirt and other substances can pass through the pump withoutcausing .excessive wear. In pumps with rigid lands, after wearv occurs,leakage often results. The lands provided in the present invention, maybe made of material highly resistant to Wear,l and are also selfseatingand will followthe contour of the rotor as Wear occurs. The pump isJwell l adapted for different kinds of liquids having different filmthicknesses, since the lands will yield to permit the natural film ofliquid. This results in a considerable saving of power, since the powerrequired to break the'natural film of liquid is high.

fIn operation, let it bev assumed that the rotor is turning in aclockwise direction. Fluid will then enter-the port 12 and chamber 16,and will be discharged into the chamber 17 and out of the port 13. Inthe constructionshown in Fig. 2 in which the -ball and socket joints forthe lands are located in the chamber 16, ifV the pressure in the chamber17 is built up by outside piping, valves,

and the like, (not shown), the pressures acting against the innerandouter sidesv of the -lands will practically balance each other,

vthe lands are located in the chamber 17,

-the pressure inl said chamber exceeds a predeterminedvvalue, it willcause the lands to move away from the periphery of the rotor to permitrelief of said pressure. The predetermined -maximum pressure can .beadjusted by adjusting the compression in the springs 33. It will beevident that by this construction, any desired pressure maybe maintainedwithout the use of outside pres-v sure regulating valves.

I claim as my invention:

1. A rotary machine having, in combination, a hollow casinghavinginletand outlet passages, a rotor in said-casing, said rotorhaving internal gear teeth', an idler pinion engaging said teeth, acrescent partition between one side of vsaid pinion and said teeth, anda pair of diametrically opposed lands separated from and mounted in saidcasing, said lands being adapted to engage the periphery of said rotorto successively cut off the spaces between said gear teeth from saidpassages.

2. A rotary machine having, in combination, a hollow casing having inletand outlet passages, a pair of movable lands pivotally mounted in saidcasing at opposite sides of said passages, rotary fluid transmittingmeans having a plurality of fluid-carrying spaces and disposed-betweensaid lands and cooperating therewith to bring different fluid-carryingspaces successively into and out of communication with said'inlet anddischarge passages, and means tending to hold said lands against saidfirst mentioned means, the inner faces of said lands being partiallyexposed to the pressure in said outlet passage.

3. Arotary machine having, in combination, a hollow cylindrical casinghaving inlet and outlet passages, removable heads closing the ends ofsaid casing, a pair of diametrically opposed lands in said casing.eachf'land beingpivoted at one end to said casing, said' pivots beingadjacent to and at opposite sides of one of said passages, and the backsof said lands being exposed to the pressure in the other of saidpassages, rotary Huid transmitting means disposed between said lands,and yielding means tending to hold said lands against said first men-vtioned means.

4. A rotary machine having, in combina;l

periphery of said rotor, said lands serving successfully to cut oilsuccessivegspaces between said gear teeth from said passages as saidrotor is rotated.

5. A rotary machine, having, in combination, a hollow casing havinginlet and outlet passages, a rotor in said casing, said rotor havinginternal gear teeth, an idler pinion engaging said teeth, a partitionbetween one side of said pinion and said teeth, a pair of spaced landsmovably mounted in said casing, and means Jor holding said landsyieldingly against the periphery of said rotor.

6. A rotary machine, having in combination, a hollow casing having a lowpressure inlet and a relatively high pressure outlet, a land movablymounted in said casing, iuid transmitting means coacting with said landand adapted to carry fluid from said inletl past said land to saidoutlet, the outer surface of said land being vented to the inlet side ofsaid easing and the inner surface of said land being exposed to theoutlet side of said casing, so that when the pressure in the latterexceeds the pressure in the former by a predetermined amount it willmove the land out of engagement with the means so as to permit pressurerelief.

7. A rotary machine having, in .combination, a hollow cylindrical casinghaving an inlet passage and a discharge passage, a gear rotor in saidcasing, a pinion eccentrically related to a^nd in mesh with said rotor,a cut-of partition disposed between said' rotor and said pinion, a pairof spaced lands pivotally mounted in the inner peripheral wall ofsaidcasing at opposite sides of said passages, each of said lands havingan arcuate face in peripheral engagement with saidrotor, spring meanstending to hold said landslto said rotor, and means for ad- ]usting thepressure of said spring means.

8. A rotary machine having, in combination, a hollow casing havingadmission and discharge passages, a rotor having internal gear teeth insaid casing, a pinion mounted veccentrically of said rotor and meshingwlth sald teeth, a partition between saidpinion and said teeth, andopposed lands movably mounted in Said casing between said passages saidlands normally engaging the outer periphery of said rotorvto cut oil'the spaces between said teeth as said spaces move successively acrossthe same.

9. A machine of the 'character described having, in combination, ahollow casing hav! ing admission and discharge passages on oppositesides respectively, a rotary member mounted in said casing and havingperipheral openings adapted to convey fluid, a land mounted in saidcasing for movement toward and from said member, and means tending tourge said land toward said member, said land normally engaging theperiphery of said rotary member to cut oil said openings as the lattermove successively across said land from one passage to the other.

10. A machine having, in combination, a hollow casing having an inletpassage and a discharge passage,a rotorvin said casing, said rotorhaving a plurality of gear teeth, a pinion eccentricallyvrelated to andin mesh with said rotor, a crescent partition disposed between saidrotor and said pinion, a land movably mounted in said casing betweensaid inlet passage and said discharge passage and engaging said rotaryparts at a point where the teeth are in mesh substantially to theirfullest extent, and means for venting the back ofvsaid land to one ofsaid passages.

11. The combination with a rotor casing provided with an intake and adischarge port, a rotor mounted to rotate in the casing and having vanesspaced apart around its periphery, fluid pressure operated movablemeansmounted in the 4casing bet-Ween the said ports and being adapted toform a seal with the .outer periphery of the varies of the rotor, apinion provided with teeth engaging the vanes of the rotor andv insubstantial engagement with the said movable means, and a crescentshaped partition forming a substantial seal between the innerperipheries of the rotor vanes and the teeth of the pinion opposite saidmovable sealing means.

In testimony whereof, I have hereunto alxed my signature.

IRVEN H. WILSEY.

